Materials Literature
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Abstract Smectites in the montmorillonite-beidellite pseudo-binary system were synthesized from glass at the hydrothermal conditions 100 MPa and 250–500°C. Products were analysed by X-ray powder diffraction for randomly oriented and glycolated samples, and also according to the Greene-Kelly test. A new mixed-layer min…
SUMMARY Neither the specific surface area values (from N 2 sorption) nor the ethylene glycol monoethyl ether (EGME) retention values of 21 soil samples from New Zealand and Fiji could all be accounted for by the sum of the contributions from their component minerals. Much EGME is probably retained by internal surfaces…
Abstract Structural features of very highly disordered 2:1 trioctahedral phyllosilicates from the Madrid Basin have been studied. Application of Fourier methods to XRD patterns shows that these materials consist of random kerolite-stevensite mixed-layered phases (R = 0) with 50–80% kerolite layers, and have a very sma…
Transparent and optical-grade TiO(2) coatings were prepared by sol-gel spinning and ion-beam sputtering techniques. We investigate process parameters for the fabrication of sol-gel spin-coated TiO(2) films exhibiting high optical quality comparable with that of ion-beam-sputtered TiO( 2) films. X-ray diffraction studi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterojunctions formed from phthalocyanine and perylene thin films: photoelectrochemical characterizationJ. Danziger, J. P. Dodelet, P. Lee, K. W. Nebesny, and N. R. ArmstrongCite this: Chem. Mater. 1991, 3, 5, 821–829Publication Date (Print):September 1, 1991Publication His…
We study polymerized membranes with quenched random internal disorder, caused by impurity-induced fluctuations in the preferred metric. Although the flat phase characteristic of pure systems persists when the disorder is weak, membranes are destabilized by a disorder-induced softening of the bending rigidity at zero t…
Structural phase transitions which involve the generation of lattice strain (i.e. in ferroelastic and co-elastic crystals) are reviewed. Landau–Ginzburg theory is found to lead to an appropriate description of order parameters following the theoretical predictions over large temperature intervals. A quantum extension…
An experiment on admittance spectroscopy was performed on the ZnO-Ag alloy diodes, in which Ag was thought to diffuse into the ZnO crystal. It was found that Ag behaved as an acceptor in ZnO. Its energy level was 0.23 eV below the conduction band, and the electron capture cross section was about 6×10 -16 cm 2 .
An accurate knowledge of electron stopping power is important for calculations and simulations of electron beam interactions with solids especially in the low energy region (< 10 keV). This paper describes a simplified and rapid experimental procedure using based on electron energy loss spectroscopy which permits accu…
Abstract The addition of β‐cyclodextrin to a solution containing β‐benzyloxy‐α‐propionic‐substituted DOTA‐ and DTPA‐Gd(III) complexes leads to the formation of inclusion compounds whose equilibrium constants have been determined by NMR titrations. The main effect associated with the formation of this ‘host‐uest’ inter…
Abstract The lack of polar groups in thermoplastics (e.g., in polystyrene) provides low adhesion with cellulosic fibers. To improve compatibility between reinforcement and matrix, maleic anhydride (MA) was selected as a coupling agent for wood fiber‐filled polystyrene composites. In general, the mechanical properties…
Abstract A mathematical model is developed to describe the dynamic and pseudosteadystate behavior of chemical vapor infiltration, a process used to fabricate fiber‐reinforced ceramic matrix composites. The three‐parameter dusty‐gas model is used to describe the interaction of mass transport fluxes, partial pressures,…
Mineralogical data, thermodynamic stability (Pourbaix) diagrams, and the simplexity principle for precipitation reactions were used to evaluate corrosion product mineralogy on copper alloys exposed to sulfate-reducing bacteria. The formation of copper sulfides as corrosion products in natural surface environments is s…
Abstract Strongly held carbonates anions in the interlayer region of pyroaurite-type compounds, [ Ml II 1− x M2 III x (OH) 2 ] x + [(CO 3 ) x /2 y H 2 O] x − ( x = 0·15−0·44), can be relatively easily exchanged by other anions such as NO 3 − , Cl − or SO 4 2− dissolved in heated glycerol. Some Fe(III) of pyroaurite is…
Measurements of discharging current transients in pentyl cyanobiphenyl liquid crystals have been made at various applied voltages and temperatures. A well-characterized peak in the discharging transient is observed in both nematic and isotropic phase. A computer simulation based upon a random-walk method has been also…
A Fabry-Perot-type interferometer is described that permits the concurrent measurement of the coefficient of thermal expansion (alpha) and the thermooptic coefficient (dn/dT) of transparent materials. Measurements of the a and the dn/dT of vitreous silica and a heavy-metal fluoride glass show that the technique is acc…
The fate of the alpha-hydrogen of mandelate in the reaction catalyzed by mandelate racemase has been investigated by a mass spectroscopic method. The method entails the incubation of (R)- or (S)-[alpha-1H]mandelate in buffered D2O to a low extent of turnover (about 5-8%), esterification of the resulting mixture of man…
In a study of yam strength translation into woven fabric behavior, experiments were conducted to establish the effect of test gauge length on yarn properties. Yams produced on each of the three major spinning systems were tensile tested at varying gauge lengths. Yam strength data were fit to two-parameter Weibull dist…
Systemic administration of luteinizing hormone-releasing hormone (LHRH) in rats has been found to influence behavior independently of pituitary or ovarian function. A previous study has shown that LHRH can cross the blood-brain barrier in one direction, but it was not known whether this was due to a saturable transpor…
Charge‐discharge characteristics of electrochemically prepared V 2 O 5 ( e ‐ V 2 O 5 ) was studied as a cathode active material for lithium secondary batteries compared to cyrstalline V 2 O 5 ( c ‐ V 2 O 5 ) and amorphous V 2 O 5 ‐ P 2 O 5 ( a ‐ V 2 O 5 ‐ P 2 O 5 ) (1, 2). The e ‐ V 2 O 5 showed similar behavior to a…